Grate for burning sawdust



J. P. DUCKETT GRATE FOR BURNING SAWDUST Filed March 22, 1924 2 Sheets-Sheet 1 //7 van 011 ,1 A Du 0 5 772 J. P. DUCKETT GRATE FOR BURNING SAWDUST Dec; 23, 1924.

2 Sheets-Sheet 2 Filed March 22, 1924 Y //7 van tor; J. f? 000K577.

Altar/76y I Patentecl-DeQ ZIE, 1924. Q v

To allwhomz't my concern:

JOSEPH P. DUCKETT, .a the ring 7 is a series of lateral openings UNITED-STATES PATENT 'orrlcs.

'iosmn r. nucxn'r'r, or srs'rnns, OREGON.

'- Gnarls ron BURNING SAWDUST.

1 Application filed March 22, 1924. Serial No. 701,103.

cry of thebase. Along the upperlpart of Be it known that I,

citizen of the i United States, residing at 8. In the base dis a series of vertical open- Sisters, in the county of Deschutes and State ings 9. The grate 5 is supported by its of Oregon, have invented a] new and useful base on the beams 3 and 4. A ring-formed Improvement in Grates for Burning Sawhorizontal damper 10 has openings 10, in dust, of which the followingv is a specificait positioned to register with theopenings tion, reference being had to the accompany- 9, which damper is arranged to open and close the openings 9, and mechanism 11 is My invention relates to incinerating deprovided to operate this damper. A. ringvices as a class. formed, vertical damper 12 is arranged be- Ihe object of my invention is to provide low and in vertical parallel plane with the a device of this class, adapted to burn sawinner surface of the grate ring. 7, so that dust, and particularly in large quantities, when raisedit will slide over the-ring suras for example in the refuse thereof from face and close the openings 8. Lever ing drawings.

'inills which manufacture wood products. mechanism 13 is provided and arranged in Also to provide in my device aseries of connection with the damper 12 to raise it pyramidally arranged grates having a'large central air area, with lateral outlets and dampers to close the same, operable singly over the openings 8 to close them and lower it from them for opening to draft. The next superimposed grate It is of similar conor together, as well as an ash grate with struction to that of the grate 5, except that damper to'close. the openingstherein. These objects, as well as other advantages, I attain by the construction, combination and arrangement of parts illustrated in the accompanying drawings which form a part thereof. y 3

Fig. I is a sectional elevation of an ash-pit and my device assembled thereon in operative position, artly in section on the line I-I in, Fig; Ill

Fig. II is (a top-plan view, with parts in section, on the line II-II in Fig. I.

Fig. III is a plan view of the ash-gratedamper.

Fig. IV is a plan view of a damper ring for an incinerating grate.

Fig. V is a sectional view of said damp-- er ring on the line V-V in Fig. IV.

Fig. VI is a detail, perspective view of. one of the supporting pedestals for an incinerating grate.

Fig. VII is a detail, perspective view of a supporting bracket for ash grate damper r1 fiike characters refer to like parts in the views.

it does not have the openings-9 of the latter. The grate It is supported on top of the grate 5 and also by pedestals 15, the feet of which rest upon the beams 3. The bottom of this grate extends a convenient distance over the top of the grate 5. The next superimposed grate 16 is of similar construction to that of thegrate M and is supported upon the latter and upon pedestals 17. Acover I8 is superimposed upon and extends over the grate 16. The grates l4; and 16 have lateral openings similar to those in the grate 5, also similar vertical dampers to a open and close these draft openings, and

damper mechanism of like character to raise operate for raising and loweringthe dam- .pers singly .or simultaneously as desired. Ihe position of saw-dust material 19, to be incinerated, is indicated in Fig. I. The interior area above the central part of the ashpit, and within the respective grate rings, is open toallow complete upward draft through the same and laterally through the grate opening. A wall 21 is shown in part. This is intended to indicate the wall of any arched oven structure of common type which may be erected over the grates.

2 and lower the dampers, all as illustrated; 'Ihe damper mechanism may be arranged to It will now be observed that when sawdust material-19 is deposited from any convenient source within the arched walls mentioned, and upon the grates arranged within such walls, the dampers are operated to open part or all of the damper openings, as may be desired, to obtain the most edective draft to insure combustion of the saw-dust, which, from its fine nature tends to pack and obstruct ready combustion. It will be seen that a strong lateral draft from the center can thus be produced through the material at varying eights thereof. This insures a very steady and complete combustion. It will further be seen that the grates, each extending over the one below, tends to prevent the material from packing closely in vertical position against the vertical grate surface, and leaves a space in the angle thus formed, into and through which the air may more readily pass. The object of the damper openings 10 is to provide means to allow ashes to drop or be raked through them into the ash-pit below, from which they may be removed more easily. I am aware that various devices have been made to burn material which may pack more or less in mass, but none is arranged or constructed as mine is. It should beremembered that the object of my device is to cause a steady combustion of all the material and inthe least period of time. lit is well known that a very large amount of saw-dust accumulates about a mill handling wood products, which occupies needed space and also creates a dangerous It is highly advanta fire risk to the. mill. geous to quickly and economically dispose of this waste material. At the same time, also to derive benefit and profit from its incineration in any possible manner. The arrangement of the grates is such that the heat derived from combustion of material thereon may be employed to develop power. This would necessarily requirean enclosing wall. If it is desired simply to dispose of the sawdust, the incinerator may be laced conveniently to the mill to receive t 1e saw-dust and the mass incinerated ver rapidly and 'efi'ectually. tional support for the grates, tending to retain them in position and prevent their warping because of the intense heat.

I claim a 1. In an incinerating device, the combina-' tion of illustrated elements as follows; aseries of ring-shaped gratesp ramidally arranged and superimposed, e ch grate having lateral draft openings in its upper vertical part, the grates above the lowest extending over the one below a convenient distance, and circular dampers arran dwithin each grate ring, vertically slidab e over its inner surface and adapted to open and close the draft openings.

2. In an incinerating device, the combination of illustrated elements as follows; a

series of ring-shaped grates pyramida-lly arranged and superimposed, each grate having lateral dra openings in its upper vertical part, the grates above the lowest extend fling over the one below a convenient distance,

The pedestals a 0rd an addi neeonae circular dampers arranged within each grate ring, vertically slidable over its inner surface and ada ted to open and close the draft openings, an damper mechanism arranged within the grate areas, connected with the dampers and adapted to operate them singly or together.

3. In an incineratingdevice, the combination of illustrated elements as follows; a series of ring-shaped grates pyramidally arranged and superimposed, each grate having lateral dratt openings in its upper vertical part, the grates above the lowest extending over the one below a convenient distance, a cover, support-ed over the uppermost of the grate series, and extending likewise over the grate below, and circular dampers arranged within each grate ring, vertically slidableover its inner surface and adapted to open and close the draft openings.

at. In an incinerating device, the combination of illustrated elements as follows; a series of ring-shaped grates pyramidally arranged and superimposed, each grate having lateral draft openings in its upper vertical part, the grates above the lowest extending over the one below a convenient distance, a cover, supported over the uppermost of the grate series, and extending likewise over the grate below, circular dampers arranged within each grate ring, vertically slidable over its inner surface and adapted to open and close the draft openings, and damper mechanism arranged within the grate areas, connected with the dampers and adapted to operate them singly or together.

5. In an ihcinerating device, the combination of illustrated elements as follows; a ringsha d grate having lateral draft openings an asupporting base with vertical openin in said base, arranged for the passage 0 material through them, a series of similar grates pyramidally superimposed above the said lowest grate, the base of each grate extending a convenient distance over the one below, a cover, supported over the uppermost of the grate series, and likewise extending over the grate below, and auxiliary supporting means arranged within the grate area to support each grate between the said lowest grate and the grate cover.

6. In an incinerating device, thevcombination of illustrated elements as follows; a ring-shaped gratehaving lateral draft openings and a supporting base, a series of SlIIlilar grates pyramidally superimposed above the said lowest grate, the base of each grate extending a convenient distance over the one below, a cover, supported over the uppermost of the'grate series, and likewise extending over the grate below, auxiliary supporting means arranged within the grate area to support each grate betweendhe said lowest grate and the grate cover. circulardampers arranged within each grate ring, vertically slidable over their respective inner surfaces and adapted to open and close the draft openings of each grate, and damper mechanism arranged within the grate areas, connected with the dampers and arranged to operate them singly or together.

7. In an incinerating device, the combination of illustrated elements as follows; a ring-sha ed grate having lateral draft openings an a supporting base with vertical openings in said base, arranged for the passage of material through them, a series of similar grates pyramidally superimposed above the said lowest grate, the base of each grate extending a convenient distance over the one below, a cover, supported over the uppermost of the grate series, and likewise extending over the grate below, auxiliary supporting means arranged within the grate area to support each grate between the said lowest grate and the grate cover, a damper having openings registrable with said base vertical openings and damper mechanism arranged and adapted to operate said damper to open and close the said base openings.

8. In an incincrating device, the combination of illustrated elements as follows; an ash-pit, a ring-shaped grate having lateral draft openings and a supporting base resting on the ash-pit, a series of similar grates pyramidally superimposed above .the said lowest grate, the base of each grate extending a convenient distance over the one below, a cover, supported over the uppermost of the grate series, and likewise extending over the grate below, and auxiliary supporting means arranged within the grate area to support each grate between the said lowest grate and the grate cover.

9. In an incinerating device, the combination of illustrated elements as follows; a ring-shaped grate having lateral draft openings in its upper vertical part, and a circular damper arranged within the grate ring, vertically slid-ably over its inner surface and adapted to open and close the draft open.- ings.

10. In an incinerating device, the combination of illustrated elements as follows; a ring-shaped grate having lateral draft open ings in its upper vertical part, a circular damper arranged Within the grate ring, vertically slidable over its inner surface and adapted to open and close the draft openings, and damper mechanism within and below the grate area, connected with the damper and adapted to operate it.

v JQSEPH P. DUCKETT.

Witnesses:

Grown; l5. Arrltnsr, FRANK MCDONALD. 

